Enhancement of the mechanical and thermal transport properties of carbon nanotube yarns by boundary structure modulation

Shikata, Ryo; Suzuki, Hiroo; Hayashi, Yu Ichi; Hasegawa, Taisuke; Shigeeda, Yuho; Inoue, Hirokazu; Yajima, Wataru; Kametaka, Jun; Maetani, Mitsuaki; Tanaka, Yuichiro; Nishikawa, Takeshi; Maeda, Satoshi; Hayashi, Yûji; Hada, Masaki

doi:10.1088/1361-6528/ac57d5

Cited by 5 publications

(2 citation statements)

References 43 publications

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“…Brittle fracture was also found, which is in agreement with theoretical predictions and experiments in other works. [63][64][65] Besides, the SWCNT with a higher torsion degree possessed higher stretchability. Fig.…”

Section: Resultsmentioning

confidence: 99%

Mechanical and thermal properties of carbon nanotubes in carbon nanotube fibers under tension–torsion loading

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Mechanical and thermal properties of carbon nanotubes in carbon nanotube fibers under tension–torsion loading

et al. 2022

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“…Sometimes the latter dominates the physical properties such as the thermal, electrical, and mechanical properties. [1][2][3][4][5][6][7][8][9] The junctions have poor thermal conductance, electrical conductance, and mechanical strength due to the vdW interactions, which are drastically weaker than the in-plane covalent bondings of CNTs. [10][11][12][13][14][15][16] Furthermore, it has been suggested that the transport properties of nanotubes themselves could be affected by the intertube interactions.…”

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confidence: 99%

The van der Waals cohesive force between two carbon nanotubes

Hamasaki

Hirahara²

2023

Appl. Phys. Express

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Van der Waals cohesive forces acting at a single-contact between two carbon nanotubes were experimentally investigated. An isolated nanotube was brought in contact with another one under observation by transmission electron microscopy. The cohesive forces of contacted nanotubes were obtained as the separation forces of the contact, which were estimated from the deflection and Young’s modulus of nanotubes. As a result, the cohesive forces at cross-contacts ranged from 1.7 to 8.5 nN and increased with the increase in the diameter of nanotubes. The closed-cap of the nanotube indicated a nine times larger cohesive force than that of the sidewall.

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N‐DMBI Doping of Carbon Nanotube Yarns for Achieving High n‐Type Thermoelectric Power Factor and Figure of Merit

Suzuki,

Kametaka,

Nakahori

et al. 2024

Small Methods

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The application of carbon nanotube (CNT) yarns as thermoelectric materials for harvesting energy from low‐grade waste heat including that generated by the human body, is attracting considerable attention. However, the lack of efficient n‐type CNT yarns hinders their practical implementation in thermoelectric devices. This study reports efficient n‐doping of CNT yarns, employing 4‐(1, 3‐dimethyl‐2, 3‐dihydro‐1H‐benzimidazole‐2‐yl) phenyl) dimethylamine (N‐DMBI) in alternative to conventional n‐dopants, with o‐dichlorobenzene emerging as the optimal solvent. The small molecular size of N‐DMBI enables highly efficient doping within a remarkably short duration (10 s) while ensuring prolonged stability in air and at high temperature (150 °C). Furthermore, Joule annealing of the yarns significantly improves the n‐doping efficiency. Consequently, thermoelectric power factors (PFs) of 2800, 2390, and 1534 µW m−1 K−2 are achieved at 200, 150, and 30 °C, respectively. The intercalation of N‐DMBI molecules significantly suppresses the thermal conductivity, resulting in the high figure of merit (ZT) of 1.69×10−2 at 100 °C. Additionally, a π‐type thermoelectric module is successfully demonstrated incorporating both p‐ and n‐doped CNT yarns. This study offers an efficient doping strategy for achieving CNT yarns with high thermoelectric performance, contributing to the realization of lightweight and mechanically flexible CNT‐based thermoelectric devices.

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Enhancement of the mechanical and thermal transport properties of carbon nanotube yarns by boundary structure modulation

Cited by 5 publications

References 43 publications

Mechanical and thermal properties of carbon nanotubes in carbon nanotube fibers under tension–torsion loading

Mechanical and thermal properties of carbon nanotubes in carbon nanotube fibers under tension–torsion loading

The van der Waals cohesive force between two carbon nanotubes

N‐DMBI Doping of Carbon Nanotube Yarns for Achieving High n‐Type Thermoelectric Power Factor and Figure of Merit

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